The first book of the Airborn adventures. Other titles include Skybreaker, and Starclimber.

Reviewed by Kirkus: Entrancing, exciting adventure with airships, pirates, and mysterious flying mammals takes place on an earth with the same geography as ours but different technology. Fifteen-year-old Matt works as cabin boy on the Aurora, a two-million-pound airship kept aloft by gas cells filled with hydrium, the lightest gas in the world. Matt loves the skies; aground, he feels stifled and claustrophobically disconnected from his late father, who was also an Aurora worker. Kate, a rich passenger Matt's age, boards the Aurora in search of furry, flying sky mammals mentioned in her late grandfather's journal but unknown to anyone else. A pirate attack forces an emergency landing on an uncharted island in the Pacificus ocean. Matt's intricate knowledge of his ship and Kate's cheerfully stubborn determination bring them, scrabbling hard, to victory over the brutal pirates and discovery of the wondrous cloud cats. Full of a sense of air, flying details, and action. (airship diagram) (Fantasy. 10-14) (Kirkus Reviews, May 15, 2004)